/Engine/Source/Runtime/GeometryCore/Public/MeshQueries.h
Given a mesh and a subset of mesh edges, compute the min, max, and mean edge lengths.
static void EdgeLengthStatsFromEdges ( const TriangleMeshType & Mesh, const [TArray](API\Runtime\Core\Containers\TArray)< int > & Edges, double & MinEdgeLength, double & MaxEdgeLength, double & AverageEdgeLength )